3-x=-15-7x

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Solution for 3-x=-15-7x equation: 



3-x=-15-7x

We move all terms to the left:

3-x-(-15-7x)=0

We add all the numbers together, and all the variables

-x-(-7x-15)+3=0

We add all the numbers together, and all the variables

-1x-(-7x-15)+3=0

We get rid of parentheses

-1x+7x+15+3=0

We add all the numbers together, and all the variables

6x+18=0

We move all terms containing x to the left, all other terms to the right

6x=-18

x=-18/6

x=-3

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